File: scroll-marker-group-007.html

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<!doctype html>
<meta charset="utf-8">
<title>CSS Test: two scroll-marker-group with dynamic change</title>
<link rel="match" href="scroll-marker-group-007-ref.html">
<link rel="help" href="https://drafts.csswg.org/css-overflow-5/#scroll-marker-group-pseudo">
<style>
  div::scroll-marker-group {
    display: flex;
    height: 50px;
    width: 100px;
  }

  div.scroll-marker-group-before {
    overflow: auto;
    scroll-marker-group: before;
  }

  div.scroll-marker-group-before::scroll-marker-group {
    background: green;
  }

  div.scroll-marker-group-after {
    overflow: auto;
    scroll-marker-group: after;
  }

  div.scroll-marker-group-after::scroll-marker-group {
    background: yellow;
  }
</style>
<div id="target1"></div>
<div id="target2"></div>
<script>
  document.documentElement.offsetTop;
  target1.className = "scroll-marker-group-before";
  target2.className = "scroll-marker-group-after";
  document.documentElement.offsetTop;
</script>